Wondrous Item, Artifact, Jewelry (Head), Requires Attunement
Dwemer Items are made of a unique alloy simply known as Dwemer Metal. Dwemer Metal is resistant to rust or acid corrosion. (This resistance does not extend to the wearer but simply reduces the damage the item would take from such effects.)
When the wearer fails a Constitution saving throw made to maintain Concentration on a spell or magical effect (as with Invoke Duplicity), a reaction may be used to succeed instead. This feature can be used once per short or long rest.